/*
 * Copyright (c) 2013, 2022, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package org.graalvm.visualizer.filter;

import java.util.EventListener;

/**
 * Allows to listen on filter chain operations and their results.
 *
 * @author Svatopluk Dedic
 */
public interface FilterListener extends EventListener {
    /**
     * Informs that a filter is about to execute
     *
     * @param e event
     */
    public default void filterStart(FilterEvent e) {
    }

    /**
     * Fired when the filter finished execution, potentially reporting an error
     *
     * @param e the event
     */
    public default void filterEnd(FilterEvent e) {
    }

    /**
     * Filter execution is about to start
     *
     * @param e event
     */
    default public void executionStart(FilterEvent e) {
    }

    /**
     * Filter execution terminated
     *
     * @param e
     */
    default public void executionEnd(FilterEvent e) {
    }
}
